Breadcrumb Home > Thesaurus > S Synonyms of slag Find synonyms for: Noun 1. slag, scoria, dross, scum usage: the scum formed by oxidation at the surface of molten metals Verb 1. slag, convert usage: convert into slag WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of slag (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: demagogue Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language